• Internet History of Science Sourcebook
• Science Research Portal

BIOLOGY

• Genetic Engineering Home Page
• Genetics Education Center
• Kimball's Biology Pages

CHEMISTRY

• ChemFinder Searching
• WebElements Periodic Table 

EARTH SCIENCES

• Cosmic Objects
• Earth Science World: ImageBank
• Nine Planets: Multimedia Tour of Solar System
• Virtual Fossil Museum

ENVIRONMENTAL SCIENCES

• Conservation and Research Center
• EcoEarth
• Environmental Defense Fund Scorecard
• EnviroLink
• US Fish & Wildlife Service National Image Library

PHYSICS

• Help for Physics Students
• Martindale's Ref Desk:  Physics Center
• The NASA Homepage
• Physics 2000
• Physics Central
• PhysLINK:  The Ultimate Physics Resource
• Web Physics